MGS MOC Release No. MOC2-509, 10 October 2003 This April 2003 Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows dark sand dunes in a crater north of Syrtis Major near 27.1N, 297.2W. The steepest slopes on each dune face toward the bottom/lower left of the image, indicating that the dominant winds that influenced their formation came from the north (the top of the image). Layers are exposed in a butte at the lower right corner of the picture; this butte is a remnant of layered rock that once covered the entire crater floor on which the dunes occur. This picture covers an area 3 km (1.9 mi) wide and is illuminated by sunlight from the lower left.